Progress was made over the weekend—starting Friday, 9pm through Saturday afternoon—on New York City’s One Vanderbilt Avenue as construction crews poured 4,000 cubic yards of concrete foundations into the excavated site. The KPF-designed project broke ground in October of last year after a lengthy squabble over air rights and the controversial rezoning of portions of Midtown.

The project’s 1,401-foot, 58-story height was made possible through a special permit which will see the developer make $220 million worth improvements to Grand Central’s transportation infrastructure and pedestrian access. The complex foundation design is indicative of those improvements, making the concrete pour one of the largest in New York City’s history.

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